[Idna-arabicscript] mapping of Full Stops

[Vint Cerf]

Sarmad,

thanks to you and to the others who contributed to this discussion.  
Your point about the code point being disallowed is one of the areas  
in which we accepted some "breakage" in exchange for the unicode  
version independence of idna2008.

v

On Oct 13, 2009, at 2:04 PM, Sarmad Hussain wrote:

>
> John, thank you for referring to the visual similarity to hyphen.   
> This creates an issue with U+06D4 (though evident only when one  
> argues not collapsing it with hyphen):
>
> 	If U+06D4 is allowed, the domain name mail.mydomain.com.pk
> 	can also be represented as mail۔mydomain۔com۔pk (all Arabic full  
> stops).
> 	However, this may be phished by mail-mydomain۔com۔pk (first hyphen,
> 	then Arabic full stops), which would take the user to mail-mydomain
> 	(with hyphen) instead of mydomain within .com.pk.
>
> In this context, I agree with the group that this needs to be  
> investigated further and would retract the request from the Last Call.
>
> However, do note, in context of other comments, U+06D4 is a  
> DISALLOWED code in IDNA200x protocol.  This does imply that any  
> previous registered domain names with U+06D4 as part of the label  
> would be rejected by any application conforming with the upcoming  
> IDNA protocol
>
> Thank you all for the fruitful discussion.
>
> Regards,
> Sarmad
>
>
>
>> -----Original Message-----
>> From: John C Klensin [mailto:klensin at jck.com]
>> Sent: Tuesday, October 13, 2009 3:45 AM
>> To: Wil Tan; Erik van der Poel
>> Cc: Andrew Sullivan; sarmad.hussain at nu.edu.pk; idna-
>> update at alvestrand.no; Martin J. Dürst; Vint Cerf; Arabic Scripts  
>> IDNA
>> Subject: Re: [Idna-arabicscript] mapping of Full Stops
>>
>>
>>
>> --On Tuesday, October 13, 2009 08:42 +1100 Wil Tan
>> <wil at cloudregistry.net> wrote:
>>
>>> xn--klb.com (U+06D4 + ".com") is registered and resolves.
>>
>> In other words, substituting a look-alike glyph, we have a
>> domain name that would appear to be
>>      -.com
>> we could also have U+06D4 U+002D U+06D4 and see
>>      ---.com
>> (in some fonts, the hyphen would be rendered a little higher
>> than the Arabic full stop)
>>
>> I think think this illustrates several things, one of which
>> involves some rude words about both a certain registry and
>> ICANN's ability and willingness to enforce its guidelines.
>>
>> In a different world (something I wouldn't suggest and the fact
>> that we are in Last Call has nothing to do with it), it would be
>> reasonable for us to be having a discussion, not about using
>> U+06D4 as a label separator (i.e., treating it is "dot"), but
>> about mapping it to hyphen-minus as a separator character inside
>> labels.
>>
>>   john
>>
>>
>>
>>
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>> signature database 3811 (20090129) __________
>>
>> The message was checked by ESET NOD32 Antivirus.
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>
>
> __________ Information from ESET NOD32 Antivirus, version of virus  
> signature database 3811 (20090129) __________
>
> The message was checked by ESET NOD32 Antivirus.
>
> http://www.eset.com
>
>